MPC8323E datasheet(48/82 Pages) FREESCALE

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MPC8323E PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 4

Freescale Semiconductor

USB

20 USB

This section provides the AC and DC electrical specifications for the USB interface of the MPC8323E.

20.1

USB DC Electrical Characteristics

Table 53 provides the DC electrical characteristics for the USB interface.

20.2

USB AC Electrical Specifications

Table 54 describes the general timing parameters of the USB interface of the MPC8323E.

Figure 41 provide the AC test load for the USB.

Figure 41. USB AC Test Load

Table 53. USB DC Electrical Characteristics1

Parameter

Symbol

Min

Max

Unit

High-level input voltage

VIH

2OVDD + 0.3

Low-level input voltage

VIL

–0.3

0.8

High-level output voltage, IOH = –100 μAVOH

OVDD – 0.2

—

Low-level output voltage, IOL = 100 μAVOL

—0.2

Input current

IIN

—±5

μA

Note:

1. Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2.

Table 54. USB General Timing Parameters

Parameter

Symbol1

Min

Max

Unit

Notes

USB clock cycle time

tUSCK

20.83

—

Full speed 48 MHz

USB clock cycle time

tUSCK

166.67

—

Low speed 6 MHz

Skew between TXP and TXN

tUSTSPN

—5

—

Skew among RXP, RXN, and RXD

tUSRSPND

—

Full speed transitions

Skew among RXP, RXN, and RXD

tUSRPND

—

100

Low speed transitions

Notes:

1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(state)(signal) for receive signals

and t(first two letters of functional block)(state)(signal) for transmit signals. For example, tUSRSPND symbolizes USB timing (US) for the

USB receive signals skew (RS) among RXP, RXN, and RXD (PND). Also, tUSTSPN symbolizes USB timing (US) for the USB

transmit signals skew (TS) between TXP and TXN (PN).

2. Skew measurements are done at OVDD/2 of the rising or falling edge of the signals.

Output

Z0 = 50 Ω

OVDD/2

RL = 50 Ω

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